154861 has 4 divisors (see below), whose sum is σ = 176992. Its totient is φ = 132732.

The previous prime is 154849. The next prime is 154871. The reversal of 154861 is 168451.

154861 = 39² + 40² + ... + 80².

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 154861 - 2⁷ = 154733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11055 + ... + 11068.

It is an arithmetic number, because the mean of its divisors is an integer number (44248).

2¹⁵⁴⁸⁶¹ is an apocalyptic number.

It is an amenable number.

154861 is a deficient number, since it is larger than the sum of its proper divisors (22131).

154861 is an equidigital number, since it uses as much as digits as its factorization.

154861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22130.

The product of its digits is 960, while the sum is 25.

The square root of 154861 is about 393.5238239294. The cubic root of 154861 is about 53.7007914511.

The spelling of 154861 in words is "one hundred fifty-four thousand, eight hundred sixty-one".